WO2013002401A1 - Appareil de réseau de haut-parleurs - Google Patents

Appareil de réseau de haut-parleurs Download PDF

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Publication number
WO2013002401A1
WO2013002401A1 PCT/JP2012/066809 JP2012066809W WO2013002401A1 WO 2013002401 A1 WO2013002401 A1 WO 2013002401A1 JP 2012066809 W JP2012066809 W JP 2012066809W WO 2013002401 A1 WO2013002401 A1 WO 2013002401A1
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WO
WIPO (PCT)
Prior art keywords
sound
speaker
speaker array
receiving point
audio signal
Prior art date
Application number
PCT/JP2012/066809
Other languages
English (en)
Japanese (ja)
Inventor
進 澤米
健一朗 竹下
Original Assignee
ヤマハ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ株式会社 filed Critical ヤマハ株式会社
Priority to CN201280032545.XA priority Critical patent/CN103636238B/zh
Priority to EP12805311.3A priority patent/EP2739071A4/fr
Priority to US14/129,180 priority patent/US9167369B2/en
Publication of WO2013002401A1 publication Critical patent/WO2013002401A1/fr
Priority to US14/850,416 priority patent/US9560450B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/401—2D or 3D arrays of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
    • H04R2203/12—Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction

Definitions

  • the present invention relates to a technique for reflecting sound using a speaker array to reach a sound receiving point.
  • Patent Document 1 discloses a technique in which sound from left and right surround channels is reflected from a speaker array installed in front of a sound receiving point to reach the sound receiving point. Thereby, a virtual speaker (virtual speaker) is formed in the direction of the wall surface on the left and right of the sound receiving point.
  • the position where the speaker array device for outputting the sound of the television is arranged and the position where the image representing the sound source is displayed on the screen of the television are separated. More and more listeners feel uncomfortable. When these positions are separated in the horizontal direction, the discomfort can be reduced by forming virtual speakers in the direction of the left and right wall surfaces of the listener by the above speaker array. When these positions are separated from each other in the vertical direction, for example, when the position where the image representing the sound source is displayed above the position of the speaker array apparatus is vertically above, it is viewed from the listener. If the virtual speaker is formed in the direction of the ceiling, the uncomfortable feeling can be reduced.
  • the present invention has a plurality of first speaker units arranged side by side in a first surface, is directed to a specific first directional direction, and the plurality of first speakers.
  • a first speaker array that outputs a first sound capable of adjusting an angle of the first directivity direction with respect to the arrangement direction of the units from the plurality of first speaker units, and a first sound different from the first surface.
  • a plurality of second speaker units arranged side by side in two planes, directing in a specific second directivity direction, and the second directivity with respect to the arrangement direction in which the plurality of second speaker units are disposed
  • a second speaker array that outputs a second sound, the angle of which can be adjusted, from the plurality of second speaker units, and the second speaker array is disposed in a room having a ceiling as a sound reflecting surface.
  • the speaker array device is characterized in that the second speaker array is installed so that the normal line of the second surface is along the direction of reaching the sound receiving point.
  • the second speaker array outputs a supplied audio signal as the second sound, the length of the path of the second sound from the second speaker array to the sound receiving point, and the A delay unit that delays the audio signal in accordance with a difference between a path length of the first sound from the first speaker array to the sound receiving point, and the first speaker array is delayed by the delay unit; An audio signal is output as the first sound.
  • the audio speaker includes attenuation means for attenuating a frequency band equal to or lower than a predetermined boundary frequency in a frequency band of a sound represented by the audio signal
  • the second speaker array includes the attenuation
  • the audio signal attenuated by the means is output as the second sound
  • the first speaker array has the audio signal in a frequency band equal to or lower than the boundary frequency in the frequency band of the sound represented by the audio signal. Is output as the first sound without being attenuated.
  • a determination unit that determines a direction in which a virtual image is to be formed at the sound receiving point by the first sound and the second sound, and the first sound according to the direction determined by the determination unit.
  • adjusting means for adjusting the volume of each of the first sound and the second sound, the boundary frequency, or the time for which the delay means delays the audio signal, and the first speaker array is adjusted by the adjusting means
  • the audio signal processed using the result is output as the first sound
  • the second speaker array outputs the audio signal processed using the result adjusted by the adjusting means as the second sound.
  • the diaphragms of the plurality of second speaker units are present at positions where the diaphragms cannot be seen from the sound receiving point.
  • the present invention it is possible to realize a small speaker array device in which a plurality of virtual speakers are formed in each of the horizontal direction and the ceiling direction, compared to a case where at least two speaker arrays are not installed as in the present configuration.
  • FIG. 1 It is a block diagram which shows the structure of the speaker array apparatus which concerns on embodiment. It is a figure which shows the external appearance of a speaker array apparatus.
  • (A), (b) is a figure which shows the example of the angle which the 1st directivity direction of a surround beam and the 2nd horizontal direction which a 1st speaker array arranges makes. It is a figure which shows the cross section of the speaker array apparatus seen in the 2nd horizontal direction.
  • FIG. 1 is a block diagram showing the configuration of the speaker array device 1.
  • the speaker array device 1 includes a control unit 2, a storage unit 3, an operation unit 4, an interface 5, an acoustic processing unit 30, and a first speaker array 10 connected to the acoustic processing unit 30. And the second speaker array 20.
  • the speaker array device 1 is a device that outputs sound directed in a specific direction from the first speaker array 10 and the second speaker array 20 by processing the audio signal by the acoustic processing unit 30.
  • the sound directed in this specific direction is referred to as a sound beam.
  • the control unit 2 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.
  • the control unit 2 controls each unit of the speaker array device 1 via the bus by executing a program stored in the storage unit 3 or the ROM.
  • the control unit 2 functions as a setting unit that controls the acoustic processing unit 30 to set parameters in each process performed in the acoustic processing unit 30.
  • the storage unit 3 is a storage unit such as a nonvolatile memory, and stores setting parameters used when the control unit 2 controls each unit.
  • This setting parameter includes a parameter indicating the sound volume of the sound beam and a parameter set by the control unit 2 according to the direction in which the sound beam is output and used by the acoustic processing unit 30.
  • the operation unit 4 has operation means such as an operation button for inputting a volume for adjusting the volume level and an instruction to change the setting, and outputs information indicating the operation content to the control unit 2.
  • the interface 5 is an input terminal for acquiring the audio signal Sin from the outside.
  • Each of the first speaker array 10 and the second speaker array 20 includes a plurality of speaker units, and directs audio signals input from the sound processing unit 30 from these speaker units, thereby directing a specific direction. Output sound.
  • the subwoofer 40 outputs a low-frequency sound.
  • the acoustic processing unit 30 processes the audio signal Sin acquired through the interface 5 and generates audio signals output from the first speaker array 10, the second speaker array 20, and the subwoofer 40, respectively.
  • the sound processing unit 30 supplies the generated audio signals to the first speaker array 10, the second speaker array 20, and the subwoofer 40, respectively.
  • FIG. 2 is a diagram showing the appearance of the speaker array device 1.
  • FIG. 2 shows a state in which the speaker array device 1 is installed on a horizontal floor surface.
  • the speaker array device 1 has a hollow housing 6 in which a first speaker array 10 and a second speaker array 20 are provided.
  • the housing 6 has a six-sided prism shape including rectangular surfaces 61 and 62 and a trapezoidal surface 63 adjacent to each other.
  • the first speaker array 10 is provided on the surface 61
  • the second speaker array 20 is provided on the surface 62.
  • the surface 61 is a surface along the vertical direction Y. Further, the surface 61 is a surface directed toward the listener when the speaker array device 1 is installed. That is, the surface 61 is the front surface of the speaker array device 1.
  • the first horizontal direction Z is a direction orthogonal to the vertical direction Y.
  • the surface 62 is a surface directed toward the ceiling when the speaker array device 1 is installed in a room.
  • the surface 63 is a surface that becomes a side surface when the housing 6 is viewed from the front (from the surface 61 side).
  • the first speaker array 10 has 14 speaker units from the first speaker units 101 to 114.
  • these plural speaker units are referred to as “first speaker unit 100” when they are not distinguished from each other.
  • the first speaker units 100 are respectively arranged in the surface 61 (first surface) so as to be aligned in the second horizontal direction X, which is a direction orthogonal to both the vertical direction Y and the first horizontal direction Z.
  • the second horizontal direction X is a horizontal direction and a direction along the surface 61.
  • each first speaker unit 100 has a longitudinal direction (which is referred to as a longitudinal direction of the first speaker array 10) of the shape (in this case, a straight line) formed by the arrangement of the first speaker units 100 along the second horizontal direction X.
  • the phrase “arranged in the surface 61” as used herein means that the end portion of the diaphragm having the larger diameter of the first speaker unit 100 is disposed so as to overlap the plane including the surface 61. .
  • the first speaker unit 100 is arranged in a state where the main axes of the sound to be output are along a specific direction (first main axis direction).
  • the surface 61 has 14 holes along the second horizontal direction X, and the first speaker units 100 are exposed from the holes.
  • the first speaker array 10 is directed from the first speaker unit 100 in a specific direction (first directivity direction), and the first directivity direction and the second horizontal direction X (the length of the first speaker array 10).
  • a sound beam (first sound) capable of adjusting the angle formed by the direction) is output.
  • 3A and 3B are diagrams showing examples of angles formed by the first directivity direction of the surround beam B1 and the second horizontal direction X in which the first speaker array 10 is arranged.
  • 3A and 3B when the speaker array device 1 is viewed from the second speaker array 20 side in the vertical direction Y, the direction in which the sound beam B1 output from the first speaker array 10 travels, that is, the first One directivity direction is shown.
  • the sound beam B1 is a parallel beam whose wavefront (strictly speaking, it is an envelope surface by a wavefront radiated from each speaker, but is simply expressed as a wavefront here) forms a plane. Show.
  • An arrow B1u shown in this figure shows an example of a path along which the wavefront of the sound beam B1 travels.
  • the wavefront of the sound beam B1 advances in a direction that forms an angle ⁇ 1 with respect to the second horizontal direction X as indicated by the arrow B1u at any position.
  • FIG. 3B shows a case where the sound beam B1 is a convergent beam whose wavefront forms a cylindrical surface. In this case, the wavefront of the sound beam B1 proceeds in the direction toward the convergence point P at any position.
  • Arrows B1v and B1w shown in this figure show examples of paths along which the wavefront of the sound beam B1 travels.
  • the wavefront of the portion of the sound beam B1 travels in a direction that forms an angle ⁇ 2 with respect to the second horizontal direction X.
  • the wavefront of the part of the sound beam B1 travels in a direction that forms an angle ⁇ 3 with respect to the second horizontal direction X.
  • the first speaker array 10 can adjust these angles ( ⁇ 1, ⁇ 2, ⁇ 3).
  • the second speaker array 20 has ten speaker units from the second speaker units 201 to 210.
  • the plurality of speaker units are referred to as “second speaker unit 200” when they are not distinguished from each other.
  • the second speaker units 200 are arranged on the surface 62 so as to form a line along the second horizontal direction X, respectively.
  • each of the second speaker units 200 has a shape (in this case, a straight line) formed in a longitudinal direction (this is referred to as a longitudinal direction of the second speaker array 20) along the second horizontal direction X. It is arranged to be in a state.
  • the second speaker unit 200 is arranged in a state where the main axis of the sound to be output is along a specific direction (second main axis direction) different from the first main axis direction.
  • the second speaker array 20 is a speaker array for reflecting a sound beam to be output from the ceiling of the room and forming a virtual speaker on the ceiling side. Since the sound that should cause the virtual speaker to be formed on the ceiling side as viewed from the listener may often be lower in volume than the front and left and right sides of the listener, each second speaker unit 200 has the first speaker unit 100. A smaller speaker unit is used, and the number thereof is small.
  • the second speaker array 20 is directed from the second speaker unit 200 in a specific direction (second directivity direction), and the second directivity direction and the second horizontal direction X (the length of the second speaker array 20).
  • a sound beam (second sound) capable of adjusting an angle formed by (direction) is output.
  • FIG. 4 is a view showing a cross section of the housing 6 viewed in the second horizontal direction X.
  • FIG. 4 the cross section of the housing
  • the first speaker unit 100 includes a diaphragm, and is provided so that the end portion having the larger diameter of the diaphragm overlaps a plane including the surface 61.
  • the first speaker unit 100 is provided such that the diaphragm vibrates in the direction in which the surface 61 faces.
  • This direction is the first principal axis direction W1 described above, and is also a direction indicating the front of the first speaker unit 100.
  • the first principal axis direction W1 is directed to a direction along the normal line of the surface 61, that is, the first horizontal direction Z.
  • the second speaker unit 200 has a diaphragm, and is provided in a recessed portion 610 in which the surface 62 is recessed inward and a hole is formed in the bottom thereof. For this reason, in the second speaker unit 200, the end portion of the diaphragm having the larger diameter is located on the inner side of the housing 6 than the surface 62. That is, each second speaker unit 200 is arranged side by side in a plane 66 (indicated by a two-dot chain line in FIG. 4) formed by a surface including the bottom of each recess 610.
  • the flat surface 66 is a surface different from the surface 61 (first surface) and corresponds to an example of a “second surface” according to the present invention.
  • the flat surface 66 is parallel to the surface 62.
  • the second speaker unit 200 is provided such that the diaphragm vibrates in a direction along the normal line of the surface 62. This direction is the direction along the normal line of the plane 66 and the second principal axis direction W2 described above, and is also the direction indicating the front of the second speaker unit 200.
  • the surface 62 is inclined with respect to the first horizontal direction Z by an angle ⁇ 4, which is 15 degrees in this embodiment.
  • the second main axis direction W2 is also inclined toward the first horizontal direction Z by ⁇ 4, that is, 15 degrees with respect to the vertical direction Y.
  • the speaker array device 1 is configured so that the sound beam output from the audio signal input at the same timing and the sound output from the subwoofer 40 (subwoofer sound) reach the sound receiving point at approximately the same timing.
  • the timing for outputting the subwoofer sound is changed.
  • the sound receiving point means a predetermined position where the listener listens to the sound output from the speaker array device 1. In other words, the sound receiving point is assumed as a position where the listener listens. If the sound receiving point is too close to one speaker array, it becomes difficult to hear the sound from the other speaker array. It is determined to be located more than a distance away.
  • the sound receiving point is, for example, 1 m or more away from the first speaker array 10 in the normal direction of the surface 61 (the same direction as the first main axis direction W1) and lower than the height of the person. It is determined to be located. In other words, when such a position is used as the sound receiving point, the listener can listen to the sound output from the speaker array device 1 with high quality.
  • various settings are performed so as to output a sound beam that is an optimal sound at the sound receiving point.
  • the speaker array device 1 delays the timing of outputting each of these sounds according to the difference in the distance that these sounds propagate before reaching the sound receiving point.
  • the difference in distance is, for example, the length of the path until the sound beam output from the first speaker array 10 reaches the sound receiving point and the sound beam output from the second speaker array 20 reaches the sound receiving point. It is the difference with the length of the route until.
  • the control unit 2 of the speaker array device 1 delays each sound so that these sounds reach the sound receiving point at substantially the same timing (hereinafter referred to as “delay time”). And the direction in which these sounds are output (hereinafter referred to as “output direction”) are stored in the storage unit 3 in association with each other.
  • a sound beam is output from the speaker array device 1 installed in the room, and the sound is collected by a microphone installed in advance at a position assumed as a sound receiving point (hereinafter referred to as “measurement position”) while scanning the output direction. Record the recorded sound.
  • the direction in which the sound of each channel is output is selected and set as the sound beam output direction from among the directions in which the collected sound volume is larger than the surrounding output direction.
  • the time which should delay each sound beam is calculated from the arrival time to the measurement position of the sound beam output in the set output direction.
  • the setting of the output direction and the calculation of the delay time may be performed using a known technique as disclosed in Patent Document 2.
  • the sound processing unit 30 processes the audio signal based on the calculated delay time, so that a sound beam and a subwoofer sound that reach the sound receiving point at approximately the same timing are output.
  • FIG. 5 is a block diagram illustrating a functional configuration of the acoustic processing unit 30.
  • the acoustic processing unit 30 includes a decoder 310, a signal processing unit 320, a bus management unit 330, a delay unit 340, a ceiling beam generation unit 350, and a horizontal beam generation unit 360.
  • the decoder 310 decodes the input signal Sin input from the interface 5.
  • the input signal Sin represents a 5.1ch audio signal.
  • the decoder 310 supplies the 5.1ch audio signal obtained by decoding the input signal Sin to the signal processing unit 320.
  • the signal processing unit 320 adds a signal newly generated by adding reverberation, separating reverberation, or applying an effect to the supplied 5.1ch audio signal to obtain an extended signal. 330.
  • the signal processing unit 320 newly generates a three-channel extension signal from the five-channel extension signal that includes reverberation among these extension signals or is subjected to an effect, and then generates the second speaker array 20.
  • Signal hereinafter referred to as “top signal”.
  • the signal processing unit 320 sets 1 to “L ′ + SL ′” obtained by adding the extension signals “L ′” and “SL ′” generated from the “L” and “SL” channels among the five channels.
  • “R ′ + SR ′” obtained by adding the extension signals “R ′” and “SR ′” generated from the “R” and “SR” channels is defined as two channels (referred to as “top L” channel).
  • One channel this is referred to as a “top surface R” channel).
  • the channel “C” attenuated as described above is referred to as “top surface C”.
  • the signal processing unit 320 supplies the bus management unit 330 with a top surface signal having three channels of “top surface L”, “top surface R”, and “top surface C”.
  • the signal processing unit 320 uses a signal used for the first speaker array 10 (hereinafter referred to as “a”) as an input 5.1 channel audio signal or a signal obtained by subtracting the reverberation component from the input 5.1 channel signal. This signal is supplied to the bus management unit 330 as a “horizontal signal”. Thereby, the first speaker array 10 outputs the audio signal as a sound beam (first sound).
  • the signal processing unit 320 reproduces the same audio signal from both the first speaker array 10 and the second speaker array 20, the sound represented by the other signal depends on the volume of the sound represented by the one signal. Reduce the volume of.
  • the sound for the horizontal signal represents a sound having a volume of 30%.
  • the horizontal signal represents a sound having a volume of 90%.
  • the bus management unit 330 separates a low-frequency audio signal including a subwoofer LFE (Low ⁇ Frequency Effect) channel (hereinafter referred to as a “subwoofer signal”) from these supplied audio signals. . Accordingly, the audio signal is divided into a signal for the first speaker array 10 (hereinafter referred to as “front signal”), a top signal, and a subwoofer signal. In addition, the bus management unit 330 performs a process of attenuating a sound in a frequency band equal to or lower than a predetermined frequency (so-called cutoff frequency) from the frequency band represented by the signal for the top surface signal. As a result, the audio signal thus attenuated is output from the second speaker array 20 as a sound beam (second sound).
  • the bus management unit 330 functions as “attenuating means” according to the present invention.
  • the bus management unit 330 supplies these audio signals to the delay unit 340.
  • the delay unit 340 (delay means) outputs the audio signal of each channel included in the supplied front signal, top signal, and subwoofer signal, and the sound beam and subwoofer sound output based on these signals as described above.
  • the delay is made according to the difference in distance until the sound receiving point is reached. Specifically, first, the delay time stored in the storage unit 3 is associated with each output direction from the control unit 2 and supplied to the delay unit 340. Then, the delay unit 340 delays the signals by a delay time associated with the direction in which the audio signal of each channel is output. Since this delay time is not for controlling directivity, the delay time is the same for each of the plurality of speaker units included in each speaker array.
  • the delay unit 340 supplies the delayed ceiling signal to the ceiling beam generator 350 and supplies the delayed front signal to the horizontal beam generator 360.
  • the delay unit 340 supplies the delayed subwoofer signal to the D / A converter connected to the subwoofer 40.
  • the ceiling beam generator 350 delays the audio signal of each channel included in the supplied top surface signal according to the output direction.
  • the time to be delayed here is a time determined for each second speaker unit 200 according to the output direction.
  • the ceiling beam generation unit 350 adds the delayed audio signals of the respective channels and outputs them to the second speaker unit 200. In this way, the ceiling beam generation unit 350 controls the directivity of sound related to the top surface signal supplied from the delay unit 340.
  • the audio signal output from the ceiling beam generator 350 is D / A converted by the D / A converter, amplified by an amplifier, and output from each second speaker unit 200 as a sound beam.
  • the sound beams of the sounds related to the channels “top L”, “top R”, and “top C” are output from the second speaker array 20 in the set directions.
  • these sound beams are obtained by outputting the above-described signal for the top surface, they are sounds having a frequency band higher than a predetermined frequency.
  • the horizontal beam generation unit 360 also performs the same processing as the ceiling beam generation unit 350, and the sound beams of sounds related to the respective channels are output from the first speaker array 10 in the set directions.
  • FIG. 6 is a diagram illustrating an example of a path of a sound beam that reaches the sound receiving point Q1 from the speaker array device 1 installed in the room 1000.
  • the first speaker array 10 and the second speaker array 20 inside the speaker array apparatus 1 are indicated by solid lines.
  • a room 1000 is a room in which a ceiling 1001, four wall surfaces 1002 and a floor surface 1003 form a rectangular parallelepiped, and a television 2000 is installed on one wall surface 1002 side.
  • the ceiling 1001 has a height from the floor surface 1003 of 2.4 m, and the floor surface 1003 is horizontal.
  • the speaker array device 1 is installed such that the first main axis direction W ⁇ b> 1 is along the floor surface 1003. That is, the speaker array device 1 is installed so that the first main shaft direction W1 faces the horizontal direction (first horizontal direction Z), as in the state shown in FIG.
  • the speaker array device 1 is installed on a TV stand together with the TV 2000.
  • the first speaker array 10 is located at a height of 0.5 m from the floor 1003, and the height of 0.6 m.
  • the second loudspeaker array 20 is positioned in the middle.
  • the sound receiving point Q1 is located on the front side of the first speaker array 10 and where the sound beam B1 output from the first speaker array 10 reaches directly.
  • reaching directly means that the sound (sound beam) output from the first speaker array 10 propagates to the sound receiving point Q1 without being reflected or diffracted.
  • the sound receiving point Q1 is a distance of 2.0 m in the first horizontal direction Z from the position where the sound beam B2 is output from the second speaker array 20, and a height of 0.8 m from the floor 1003. It is located in the place.
  • the second speaker array 20 outputs the sound beam B2 in the second main axis direction W2 inclined 15 degrees from the vertical direction Y toward the sound receiving point Q1.
  • the sound beam B2 output in the upward direction in the vertical direction Y is reflected by the ceiling 1001 of the room 1000 and travels in the downward direction in the vertical direction Y.
  • the sound beam B2 is a sound having directivity by wavefront synthesis with respect to the second horizontal direction X, but a normal sound output from the speaker unit with respect to the first horizontal direction Z. Like, it is a free radiated sound.
  • the directivity of the speaker array cannot be provided in this direction.
  • free radiated sound refers to sound having free directivity that is not based on the wavefront synthesis of the speaker array.
  • the component B2x traveling in the second principal axis direction W2 and the component B2y proceeding in a direction inclined by 30 degrees toward the sound receiving point Q1 with respect to the vertical direction Y (ie, the second principal axis of the sound beam B2) The position at which the sound component radiated in the direction of 15 degrees with respect to the direction W2 reaches is compared.
  • the component B2x reaches the height of the sound receiving point Q1 at a position about 0.9 m away from the second speaker unit 200 in the first horizontal direction Z after being reflected by the ceiling 1001, and the component B2y is similarly about It reaches the height of the sound receiving point Q1 at a position 2.0 m away.
  • the component B2y has a volume that can be heard by the listener at the sound receiving point Q1. That is, the sound beam B2 is output so that the component B2y that freely radiates reaches the sound receiving point Q1.
  • the sound (sound beam) reaching the sound receiving point means that a sound having a volume that is substantially audible to the listener reaches the sound receiving point.
  • FIG. 7 is a diagram illustrating an example of a range in which a sound beam output from the speaker array device 1 reaches.
  • the boundary R1 of the range where the sound beam B1 reaches significantly and the boundary R2 of the range where the sound beam B2 reaches significantly are indicated by broken lines.
  • “significantly reach” means that the sound reaches the loudest volume that can be heard “from that direction” as the first sound by overcoming the preceding sound from other directions.
  • FIG. 7 shows that the sound receiving point Q1 is included in the range indicated by R1, and that the sound beam B1 reaches the sound receiving point Q1 significantly.
  • a recess 610 is provided in front of each second speaker unit 200.
  • the hollow portion 610 is present at a position where the diaphragm described in FIG. 4 cannot be seen.
  • the boundary when the second speaker array 20 is provided so that the flat surface including the surface 62 shown in FIG. 4 without the hollow portion 610 and the end portion having the larger diameter of the diaphragm overlap is R2x, the sound beam The boundary R2 shows a range narrower than the boundary R2x because the depression 610 narrows the angle at which B2 radiates.
  • the second speaker unit 200 is provided with its front face facing away from the direction where the sound receiving point Q1 is located.
  • the sound receiving point Q1 is not included in the range indicated by R2. That is, the sound beam B2 does not reach the sound receiving point Q1 directly without being diffracted.
  • the directly reached sound (hereinafter referred to as “direct sound”) is shown in FIG. Since the distance of the route to the sound receiving point Q1 is shorter than the sound reflected by the ceiling 1001 (hereinafter referred to as “reflected sound”), the same sound is heard earlier than the reflected sound.
  • the localization is felt from the direction of the speaker body due to the preceding sound effect.
  • the speaker array device 1 according to the present embodiment, only the reflected sound reaches the sound receiving point Q1, so that it can be prevented that the localization is felt from the direction of the speaker body. (Or, “The volume of the reflected sound exceeds the direct sound level by a certain level, which makes it easier to feel the localization toward the ceiling.”)
  • FIG. 8 is a diagram showing an example of the path of the sound beam B2 when the speaker array device 1 is viewed from the front.
  • the sound beam B2 is composed of sound directed in a plurality of directions with respect to the second horizontal direction X.
  • the speaker array device 1 is arranged on the left wall surface 1002L when viewed from the sound receiving point Q1.
  • the sound beam B2L that is reflected first, the sound beam B2R that is first reflected by the right wall surface 1002R, and the central sound beam B2C that is not reflected by the wall surface are output.
  • FIG. 9 is a diagram showing an example of the path of the sound beam B1 when the speaker array device 1 is viewed from the ceiling side.
  • the first speaker array 10 outputs the audio signal of the “C” channel as a sound beam B1C that goes straight to the sound receiving point Q1.
  • the first speaker array 10 receives the sound signal by reflecting the audio signal of the “R” channel on the wall surface 1002R as the sound beam B1L reflecting the audio signal of the “L” channel on the wall surface 1002L and going to the sound receiving point Q1. Output as a sound beam B1R toward the point Q1.
  • the first speaker array 10 outputs the audio signal of the “SL” channel as a sound beam B1SL which is reflected by the wall surface 1002L and the wall surface 1002B behind the sound receiving point Q1 and travels toward the sound receiving point Q1.
  • the audio signal of the channel is reflected by the wall surface 1002R and the wall surface 1002B and output as a sound beam B1SR directed to the sound receiving point Q1.
  • the speaker array device 1 forms virtual speakers in five different directions in the horizontal direction when viewed from the sound receiving point Q1 by the sound beam B1 output from the first speaker array 10.
  • the sound beam B1 is transmitted in the horizontal direction from a certain position to the sound receiving point Q1, and the sound beam B2 is directed downward from the ceiling 1001 side. It is transmitted and reaches the sound receiving point Q1. Further, as described above, the sound beams B1 and B2 output audio signals that are delayed by the delay unit 340 in accordance with the difference in distance from each speaker array to the sound receiving point Q1. Therefore, portions of the sound beams that represent the same audio signal reach the sound receiving point Q1 at substantially the same timing. When the listener is listening to these sound beams at the sound receiving point Q1, the listener feels that the sound image is localized in the direction sandwiched between the two directions as they arrive from two directions. As a result, a virtual image speaker (virtual image) also called a phantom is formed.
  • a virtual image speaker virtual image
  • FIG. 10 is a diagram showing the position of the virtual image speaker formed at the sound receiving point Q1.
  • FIG. 10 shows sound beams B1C and B2C output from the first speaker array 10 and the second speaker array 20 in the middle of the second horizontal direction X, respectively.
  • the sound beam B1C is obtained by outputting an audio signal obtained by delaying the audio signal of the sound beam B2C.
  • the sound beam B1C reaches the sound receiving point Q1, it is the same as the sound beam B2C reaching the sound receiving point Q1 at the same timing.
  • the sound is delayed so that it can be heard at the receiving point Q1.
  • FIG. 10 shows sound beams B1C and B2C output from the first speaker array 10 and the second speaker array 20 in the middle of the second horizontal direction X, respectively.
  • the sound beam B1C is obtained by outputting an audio signal obtained by delaying the audio signal of the sound beam B2C.
  • the sound beam B1C reaches the sound receiving point Q1, it is the same as the sound beam B2C reaching
  • the virtual image speaker V1 is formed in the direction toward the upper part of the television 2000 among the directions sandwiched in the direction in which the sound beams B1C and B2C come.
  • a virtual image speaker can be formed in a direction away from the sound receiving point Q1 toward the speaker array device 1 in the vertical direction Y.
  • the second speaker array 20 in which a plurality of second speaker units are arranged in the second horizontal direction X is provided with the front facing upward in the vertical direction Y.
  • the virtual speaker can be formed on the ceiling 1001 while outputting the sound beam capable of adjusting the angle formed by the direction of the sound beam of the second speaker array 20 and the second horizontal direction.
  • the speaker array device 1 causes the reflected sound from the ceiling 1001 to reach the sound receiving point Q1 located at a position distant in the first horizontal direction Z, and therefore a direction different from the second horizontal direction X in which the second speaker units are arranged.
  • the directivity of the free radiation of the sound beam B2 in the first horizontal direction Z is used.
  • the speaker array device 1 it is not necessary to arrange the second speaker units in the first horizontal direction Z or the vertical direction Y. In order to output a sound directed in the second horizontal direction X in the case where a speaker array in which speaker units are arranged in the first horizontal direction Z is provided in order to cause the reflected sound from the ceiling 1001 to reach the sound receiving point Q1. In this case, the speaker array must be further arranged in the second horizontal direction X. Compared to the speaker array device configured as described above, the speaker array device 1 can reduce the number of second speaker units and can reduce the size of the device.
  • a sound beam having a frequency band higher than a predetermined frequency is output from the second speaker array 20.
  • a high frequency sound has a higher directivity than a low frequency sound.
  • the direct sound is less likely to reach the sound receiving point Q1 than when a sound beam including a sound having a frequency lower than the frequency determined from the second speaker array 20 is output.
  • the speaker array apparatus 1 is closer to its own area in which the sound receiving point Q1 can hear the sound beam B2 without being disturbed by the direct sound from the second speaker array 20. Can be extended to position.
  • FIG. 11 is a diagram showing a configuration of a speaker array device 1a according to this modification.
  • the speaker array device 1a includes housings 6a1 and 6a2, the first speaker array 10a is provided in the housing 6a1, and the second speaker array 20a is provided in the housing 6a2.
  • the housing 6a2 is installed on the upper side of the television 2000a, the range in which the direct sound from the second speaker array 20a reaches the ceiling 1001 side as compared with the case where the second speaker array 20 is installed at a lower position. It will shift to.
  • the speaker array device 1a it is possible to make it difficult for the direct sound to reach the sound receiving point Q1 as compared with the case where the number of housings is one.
  • the angle ⁇ 4 in which the second principal axis direction W2 is inclined to the sound receiving point Q1 side with respect to the vertical direction Y is 15 degrees, but is not limited thereto. ⁇ 4 may be 30 degrees or 0 degrees.
  • ⁇ 4 is 0 degrees, the second main axis direction W2 coincides with the vertical direction Y, and the second speaker unit 200 is directed vertically upward.
  • the angle ⁇ 4 is, in short, the second main axis direction W2 is sufficiently away from the direction from the second speaker unit 200 toward the sound receiving point Q1, and a direct sound (mostly) is received at the sound receiving point Q1.
  • the front of the second speaker unit 200 is directed in a direction in which the reflected sound reaches the sound receiving point Q1 at a volume that is sufficiently larger than the direct sound even if it reaches the sound receiving point Q1 (in other words, even if it reaches, in other words)
  • the second speaker array 20 may be installed so that the normal of the surface 66 (second surface) shown in FIG.
  • “the volume of the reflected sound is sufficiently larger than the direct sound” means that the sound pressure (energy) ratio of the reflected sound to the direct sound is equal to or higher than a predetermined value.
  • FIG. 12 is a diagram showing a configuration of the speaker array device 1b according to the present modification.
  • the speaker array device 1b includes a second speaker unit 200b whose front face is oriented in a direction inclined to the opposite side of the sound receiving point Q1 with respect to the vertical direction Y.
  • the sound beam B2b output from the second speaker unit 200b is reflected by the television 2000 and then reflected by the ceiling 1001 to reach the sound receiving point Q1.
  • the second speaker unit 200b is installed at a position where the diaphragm cannot be seen when viewed from the sound receiving point Q1.
  • significant direct sound from the second speaker unit 200b reaches the range indicated by the boundary R2b.
  • the boundary R2 shown in FIG. 7 is indicated by a two-dot chain line.
  • the boundary is moved from R2 to R2b in a direction away from the sound receiving point Q1 because the direction in which the front of the second speaker unit 200 faces is away from the sound receiving point Q1.
  • the speaker array apparatus 1b can make it more difficult for the direct sound to reach the sound receiving point Q1 than when the front surface of the second speaker unit 200 is inclined toward the sound receiving point Q1.
  • the second speaker array may output a sound beam in which the above-described sound pressure ratio at the sound receiving point Q1 is approximately 12 dB (decibel) or more.
  • the listener may feel that the sound has reached only from the direction of the direct sound.
  • this phenomenon known as the so-called Hearth effect occurs, the listener can only feel that the virtual speaker that should be formed in a certain direction of the ceiling is not formed and the speaker array device itself is sounding.
  • the sound pressure ratio is 12 dB or more, the Haas effect is canceled and a virtual speaker is formed by the reflected sound in the direction in which the reflected sound arrives.
  • the speaker array apparatus can form the virtual speaker by reflected sound in the stable position.
  • the second speaker unit 200 is provided in a place where the hollow portion 610 is not provided and a hole is simply formed in the surface 62 and the interior of the housing is deeper than the plane including the surface 62 and cannot be seen from the sound receiving point Q1. Also good. In this case, a part of the sound beam B2 is blocked by the surface on the back side of the surface 62, and radiation is suppressed. Further, for example, a member that blocks a part of the path of the sound beam B2 may be provided in the housing. FIG.
  • FIG. 13 is a view showing a cross section of the housing 6c of the speaker array device 1c according to the present modification.
  • the side surfaces of the speaker units are shown.
  • the housing 6 c of the speaker array device 1 c is not provided with the recess 610 in the surface 62 c, and the end portion of the diaphragm having the larger diameter of the second speaker unit 200 c has a surface. It is provided so as to overlap with a plane including 62c.
  • the second speaker units 200 are arranged side by side in the surface 62c (an example of the second surface). Further, on the surface 62c, when the speaker array device 1c is installed as shown in FIG.
  • a shielding plate 620 is provided at a position closer to the sound receiving point Q1 than the second speaker unit 200c.
  • the diaphragm of the second speaker unit 200c is blocked by the shielding plate 620 and is present at a position where it cannot be seen.
  • the shielding plate 620 blocks a portion of the sound beam output from the second speaker unit 200c that radiates in the first horizontal direction Z.
  • FIG. 13 shows a boundary R2c in a range where a sound beam partially blocked by the shielding plate 620 reaches significantly, and a boundary R2y when there is no shielding plate 620.
  • the shielding plate 620 blocks a portion of the sound beam that radiates in the first horizontal direction Z, as shown in FIG. 13, the direct sound from the second speaker unit 200 can reach without being diffracted. There is no wide range. That is, the speaker array device 1c can make it more difficult for the direct sound to reach the sound receiving point Q1 than when the shielding plate 620 is not provided.
  • the speaker array device 1 outputs the sound beam B2 having a frequency higher than the predetermined frequency.
  • the speaker array device 1 may output the sound beam B2 in the same frequency band without removing the sound having a frequency lower than the predetermined frequency from the supplied audio signal.
  • the second speaker array 20 is installed with the front surface of the second speaker unit 200 facing in the direction in which the volume of the reflected sound is sufficiently larger than the volume of the direct sound at the above-described sound receiving point Q1. Good.
  • the first speaker units 100 are provided side by side in the second horizontal direction X, but may be provided side by side in a different direction.
  • the first speaker units 100 may be provided side by side in a direction that forms an angle with respect to the second horizontal direction X, and are arranged in an arc shape or a V shape instead of a linear shape. May be provided.
  • These linear shapes, arc shapes, or V shapes are examples of shapes formed by the arrangement of the first speaker units 100.
  • Each first speaker unit 100 may be provided in two or more rows. In any case, the first speaker units 100 may be arranged side by side in the surface 61 (first surface).
  • the first speaker array 10 is oriented in a specific direction (first directivity direction), and an angle formed by the direction and the longitudinal direction of the shape formed by the arrangement of the first speaker units 100 is adjusted.
  • a sound beam B1 (first sound) that can be output is output.
  • the longitudinal direction here is a direction along the long side of the smallest rectangle that can include a shape formed by this arrangement.
  • FIG. 14 is a diagram illustrating an example of a first speaker unit according to the present modification.
  • FIG. 14 shows a plurality of first speaker units 100e (FIG. 14A) and a plurality of first speaker units 100f (FIG. 14B), each viewed in the negative direction of the first horizontal direction Z. It shows the place.
  • the plurality of first speaker units 100e are formed in an arc shape indicated by a chain double-dashed line.
  • the rectangle T1 represents the smallest rectangle that can include this shape. In this case, the direction indicated by S1 which is an arrow along the long side T1a of the rectangle T1 is the longitudinal direction.
  • the plurality of first speaker units 100f are formed in a V-shape indicated by a two-dot chain line.
  • the rectangle T2 represents the smallest rectangle that can include this shape.
  • the direction indicated by S2 which is an arrow along the long side T2a of the rectangle T2 is the longitudinal direction.
  • Each of these first speaker units is directed to a specific direction (first directivity direction), and a sound beam (first sound) capable of adjusting the angle formed by that direction and each longitudinal direction. ) Can be output.
  • the second speaker units 200 are provided side by side in the second horizontal direction X.
  • the second speaker units 200 are arranged in different directions. May be provided side by side.
  • the second speaker units 200 may be provided side by side in a direction that forms an angle with respect to the second horizontal direction X.
  • the second speaker units may be provided so that the direction in which the second speaker units are arranged changes in the middle. In other words, the second speaker units may not be arranged in a straight line.
  • the second speaker units may be provided side by side so as to have an arc shape or a V shape.
  • the second speaker units 200 only need to be arranged in a line along the surface 66 (second surface).
  • the second speaker array 20 is oriented in a specific direction (second orientation direction), and the angle formed by that direction and the longitudinal direction of the shape formed by the arrangement of the second speaker units 200 is adjusted.
  • a sound beam B2 (second sound) that can be output is output.
  • the longitudinal direction of the second speaker array 20 is preferably along the longitudinal direction of the first speaker array 10 described above, and even when this is not along, the longitudinal direction of the second speaker array 20 is viewed from the vertical direction Y. It is sufficient that the directions are not orthogonal.
  • the speaker array device can reduce the number of second speaker units and reduce the size as compared with the case where the second speaker units are arranged in the first horizontal direction Z.
  • the second speaker array has a plurality of second speaker units arranged in a line, but a part of these second speaker units are arranged in a plurality of lines, or in the first horizontal direction Z. It may be in line. Even in this case, in the portion where the plurality of second speaker units are arranged in a line, the number of the second speaker units can be reduced and the size can be reduced as described above.
  • the place where the speaker array device 1 is installed is on the TV stand installed in the rectangular parallelepiped room 1000, but is not limited thereto, and may be another place in the room 1000. In another room having a shape other than a rectangular parallelepiped. Moreover, the place where the speaker array device 1 is installed may be outdoors. In this case, the speaker array device 1 has a reflection surface that reflects the sound beam output from the speaker array device 1 and is located at a position higher than the sound receiving point. Any space having a vertically downward reflecting surface may be used.
  • the speaker array apparatus 1 can form a plurality of virtual speakers whose positions in the second horizontal direction are different from each other in the vertically upward direction when viewed from the listener by reflecting the sound beam on the reflecting surface.
  • FIG. 15 is a diagram showing a cross section of the housing 6d of the speaker array device 1d according to the present modification.
  • the speaker array device 1 includes a second speaker unit 200d provided side by side in a surface 66d (an example of a second surface) inside the housing 6d.
  • the second speaker unit 200d is provided with the front surface facing the reflecting surface 64d inside the housing 6d.
  • An opening 65d that opens to the outside is provided on the vertically upward surface 62d of the housing 6d.
  • the sound beam B2d output from the second speaker unit 200 is reflected by the reflecting surface 64d, passes through the opening 65d, is reflected by the ceiling 1001, and reaches the sound receiving point Q1. Also in the speaker array device 1d, the diaphragm of the second speaker unit 200d is provided at a position where it cannot be seen from the sound receiving point Q1. In this case, since the range in which the sound beam B2d radiates in the first horizontal direction Z is narrowed in the opening 65d, it is possible to make it difficult for the direct sound to reach the sound receiving point Q1.
  • the sound of each channel is output toward a specific path, but the path may be dynamically changed according to the content of the sound included in each channel.
  • the speaker array device 1 compares the audio signals of the sound of the “L” and “R” channels included in the horizontal signal, and these highly correlated components are used as the “top C” channel of the top signal.
  • the output is included. In this case, the volume of the sound beam to the path for outputting the “L” and “R” channels may be reduced.
  • the speaker array device 1 when used, the image of the image expressed so as to move the sound of the image in which the sound source moves in the vertical direction from the “L” channel to the “R” channel (or vice versa).
  • the sound can be made to reach from a virtual speaker formed in a direction more matched to the position of the sound source.
  • the input signal Sin represents a 5.1ch audio signal including five channels “R”, “L”, “C”, “SR”, and “SL”.
  • the audio signal may include a height channel representing a vertical sound.
  • the signal processing unit 320 supplies the top surface signal including the height channel and the horizontal signal not including the height channel to the bus management unit 330. Thereby, the sound of the height channel is output from the second speaker array 20, and a virtual speaker is formed in which this sound is output in the ceiling direction.
  • the direction in which the virtual image speaker V1 is formed is determined as shown in FIG. 10, but in the speaker array device 1, this may be changed. This direction changes in the vertical direction Y when the difference in volume between the sound beam B1C and the sound beam B2C is changed. This direction is also changed by changing the frequency band of the sound beam B2C.
  • the speaker array device 1 first, the user operates the operation unit 4 to determine a direction in which a virtual image speaker is to be formed, and the operation unit 4 transmits information indicating the determined direction to the control unit 2. Output.
  • the operation unit 4 functions as a “decision unit” according to the present invention.
  • the control unit 2 adjusts parameters such as the volume and boundary frequency of the sound beam B1 (first sound) and the sound beam B2 (second sound) according to the information output from the operation unit 4. To do. Specifically, the control unit 2 adjusts these parameters read from the storage unit 3 in accordance with information output from the operation unit 4. Then, if the adjusted parameter is the volume, the control unit 2 supplies this to the signal processing unit 320. Further, if the adjusted parameter is the boundary frequency, the control unit 2 supplies this to the bus management unit 330.
  • the first speaker array 10 and the second speaker array 20 are shown in FIG. 5 for the audio signals output from the signal processing unit 320 or the bus management unit 330 in accordance with these parameters adjusted by the control unit 2. Are output as a sound beam.
  • control unit 2 functions as an “adjustment unit” according to the present invention.

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Abstract

La présente invention comporte : un premier réseau de haut-parleurs ayant une pluralité de premières unités de haut-parleur agencées dans une ligne dans une première surface, le réseau étant orienté dans une première direction d'orientation spécifiée, et un premier son pour lequel l'angle de la première direction d'orientation par rapport à la direction d'agencement de la pluralité de premières unités de haut-parleur peut être ajusté étant émis à partir de la pluralité de premières unités de haut-parleur ; et un second réseau de haut-parleurs ayant une pluralité de secondes unités de haut-parleur agencées dans une ligne dans une seconde surface qui est différente de la première surface, le réseau étant orienté dans une seconde direction d'orientation spécifiée, et un second son pour lequel l'angle de la seconde direction d'orientation par rapport à la direction d'agencement de la pluralité de secondes unités de haut-parleur peut être ajusté étant émis à partir de la pluralité de secondes unités de haut-parleur. Lorsque le second réseau de haut-parleurs est installé conjointement avec le premier réseau de haut-parleurs dans une salle dans laquelle le plafond est utilisé comme surface de réflexion de son, le second réseau de haut-parleurs est installé d'une manière telle qu'une perpendiculaire à la seconde surface est alignée dans une direction dans laquelle le second son est réfléchi ou diffracté à partir du second réseau de haut-parleurs et atteint seulement de manière indirecte un point de réception de son situé dans une direction perpendiculaire à la première surface et spécifié en tant que position où le premier son est entendu, ou dans une direction dans laquelle le second son atteint le point de réception de son à un volume sonore auquel le rapport de la pression acoustique du second son réfléchi à partir du plafond sur la pression acoustique du second son atteignant de manière directe le point de réception de son atteint ou dépasse une valeur spécifiée.
PCT/JP2012/066809 2011-06-30 2012-06-29 Appareil de réseau de haut-parleurs WO2013002401A1 (fr)

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CN201280032545.XA CN103636238B (zh) 2011-06-30 2012-06-29 扬声器阵列装置
EP12805311.3A EP2739071A4 (fr) 2011-06-30 2012-06-29 Appareil de réseau de haut-parleurs
US14/129,180 US9167369B2 (en) 2011-06-30 2012-06-29 Speaker array apparatus
US14/850,416 US9560450B2 (en) 2011-06-30 2015-09-10 Speaker array apparatus

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JP2011146720A JP5640911B2 (ja) 2011-06-30 2011-06-30 スピーカアレイ装置
JP2011-146720 2011-06-30

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US14/850,416 Continuation US9560450B2 (en) 2011-06-30 2015-09-10 Speaker array apparatus

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EP2739071A4 (fr) 2015-05-13
US20150382108A1 (en) 2015-12-31
EP2739071A1 (fr) 2014-06-04
US9560450B2 (en) 2017-01-31
JP2013016925A (ja) 2013-01-24
US9167369B2 (en) 2015-10-20
US20140126753A1 (en) 2014-05-08
JP5640911B2 (ja) 2014-12-17
CN103636238B (zh) 2016-09-07

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